(1200÷X)- 20 =1200÷(X+10)怎么解(要将解题过程一步一步写详细)

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(1200÷X)- 20 =1200÷(X+10)怎么解(要将解题过程一步一步写详细)
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(1200÷X)- 20 =1200÷(X+10)(1200-20X )÷ X =1200÷( X+10 )1200*X=(X+10)(1200-20X)1200X = 1200X- 20X^2 +12000 -200X1200X =1000X -20X^2+1200020X^2+200X-12000=0 X^2+10X -600X =0( X+30)(X-20) =0X+30=0...